Crew under-experienced in visual approaches or lack of manual flying skills, IMHO.
To you GPS addicted pilots, if the ground glide slope station is inop, does your GPS provide you with an accurate glide slope reading?
(In my time a GPS approach was a non-precission approach). Regardless, the conditions were visual but I’ve known too many pilots to rely on instruments and autopilot too much even on severe clear days.
When I am on final approach just prior to landing (I’m a new pilot, about 100 hours) my eyes are scanning three things. Air speed, VASI or PAPI lights, and runway centering. When those are correct the landing goes well.
One thought. When doing a go around and applying full throttle with the full flaps extended, the nose will pitch up and require considerable forward force on the yoke to prevent a stall. Sounds like that is what happened, the nose pitched up and the tail hit the ground.
RNAV (GPS) with LPV or LNAV/VNAV minimums, and RNAV (RNP) are vertically guided approaches. They can have a Height above Threshold as low as 200 feet although 250 feet is more common.